Update on non-unitary mixing in the recent NO$\nu$A and T2K data

TL;DR

This paper tests the non-unitary mixing hypothesis using recent NO and T2K data, providing constraints, best-fit parameters, and future sensitivity analysis.

Contribution

It offers the latest constraints on non-unitary mixing parameters and analyzes their impact on experimental tensions and future sensitivities.

Findings

Stronger constraints on unitary violation compared to previous data.

Reduced tension between NO and T2K at 100 for normal hierarchy with non-unitary mixing.

Future sensitivity analysis for NO, T2K, and DUNE included.

Abstract

In this paper, we have tested the non-unitary mixing hypothesis with the latest data from NO$\nu$A and T2K experiments. We have also analysed their combined data. We have provided the best-fit values of the standard and non standard parameters after the analysis. $90\%$ limits on the non-unitary mixing parameters have also been provided. The constraints on unitary violation is stronger, compared to the constraints obtained from previous data from NO$\nu$A and T2K. The tension between NO$\nu$A and T2K at the $1\,\sigma$ for normal mass hierarchy can be reduced for non-unitary mixing due to $\alpha_{10}$, albeit for a value of $|\alpha_{10}|$ larger than the present global $90\%$ limit. Additionally a study of the future sensitivity of NO$\nu$A, T2K and DUNE has been provided.